Abstract: The authors report optical properties of semiconductor clusters, CdS and PbS, encapsulated in zeolites. At a low loading level of CdS in zeolite Y, isolated clusters with size <13 A are generated. They show an absorption peak around 280 nm and do not emit even at 4.2 K. At higher loading levels, the individual clusters aggregate into an extended structure, modulated by zeolite internal cavities. It shows an exciton shoulder near 350 nm and emits at low temperature. Neither heating nor increasing CdS concentration can further shift this exciton ...
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